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. 1999 Sep 15;19(18):7732–7741. doi: 10.1523/JNEUROSCI.19-18-07732.1999

Fig. 9.

Fig. 9.

Comparison of the AI prohormone structure to those of Lymnaea, human, and locust. As the AI precursor exhibits a D peptide region, it contains characteristics of both insulin and insulin growth factors in addition to being the largest molecular weight insulin reported to date.